Ultra-thin composite film and preparation method thereof

A composite membrane, ultra-thin technology, applied in the field of membrane separation, can solve the problems of low flux of nanofiltration membrane, membrane intolerance to pollution, poor solvent resistance, etc., achieve strong quantum effect, improve hydrophilicity, and improve separation performance. Effect

Active Publication Date: 2019-08-20
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the technical problems in the prior art that the flux of nanofiltration and reverse osmosis membranes facing aqueous solution systems is relatively low, and the membranes are not resistant to pollution, and the nanofiltration membranes facing organic solvent systems have poor solvent resistance and phase inversion polyimide The technical problem of low flux of solvent-resistant nanofiltration membrane, proposes an ultra-thin composite membrane, its preparation method and its application, the prepared ultra-thin composite membrane has good separation performance

Method used

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  • Ultra-thin composite film and preparation method thereof
  • Ultra-thin composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The concentration is 100mg·L -1 The GQDs aqueous solution was sonicated for 60 min and set aside. The average thickness of the GQDs is 1.8nm; the average thickness of the GQDs is 1.9nm.

[0076] The film making steps are as follows:

[0077] Step 1: After fully contacting the base film with a polyethyleneimine solution with a concentration of 0.005wt% at 25°C for 30 seconds, remove the modifier remaining on the surface of the base film and dry it, then fully contact it with the GQDs aqueous solution for 60 seconds, and remove the surface of the film The free suspension was dried to obtain a modified hybrid membrane;

[0078] Step 2: After fully contacting the modified hybrid membrane obtained in step 1 with the aqueous phase monomer solution for 120 seconds, remove the aqueous phase monomer solution on the surface of the basement membrane and dry for 45 seconds; mix the dried membrane with the organic phase monomer solution The solution was fully contacted for 60 sec...

Embodiment 2

[0085] The difference from Example 1 is that in step 1, the polyimide base film is fully contacted with 0.025 wt % polyethyleneimine at 25° C. for 30 s.

[0086] All other steps are identical with embodiment 1;

[0087] The test conditions are the same as in Comparative Example 1.

[0088] The prepared multifunctional hybrid composite nanofiltration membrane has a rejection rate of 98.2% for rhodamine B, and a flux of ethanol of 33.8 LMH, which is much higher than that of the comparative example.

Embodiment 3

[0090] The difference from Example 2 is that the concentration of polyimide used in step 1 is 0.05wt%.

[0091] All other steps are the same as in Example 1.

[0092] The test conditions are the same as in Comparative Example 1.

[0093] The average thickness of the separated cortex is 25nm, and the average roughness is less than 2.0nm.

[0094] The prepared ultra-thin composite nanofiltration membrane has a rejection rate of 98.4% for rhodamine B and a flux of ethanol of 40.2LMH, which is much higher than that of the comparative example.

[0095] The prepared multifunctional hybrid composite nanofiltration membrane was immersed in DMF at 80°C for 8 days, the flux of ethanol was 51.7LMH, and the rejection rate of rhodamine B was 98.3%. It shows that the prepared multifunctional hybrid composite nanofiltration membrane has good solvent resistance.

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Abstract

The invention discloses an ultra-thin composite film with graphene quantum dots as an intermediate layer and a preparation method of the composite film. The preparation steps of the ultra-thin composite film with the graphene quantum dots as the intermediate layer comprises a graphene quantum dot intermediate layer addition step, an interfacial polymerization reaction step, a chemical crosslinkingstep, and a solvent activating step. The separation performance of the film is significantly improved by adding the graphene quantum dot intermediate layer, the graphene quantum dots have a large amount of hydroxyl groups and carboxyl groups, the hydrophilicity of a base film can be increased, the pore size is reduced, the interfacial polymerization reaction is facilitated, and therefore the separation performance of the film is effectively improved. The preparation process is simple, and the composite film has a good application prospect in the field of organic solution system separation.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to an ultrathin composite membrane and a preparation method thereof. Background technique [0002] Seawater desalination membrane technology can remove macromolecules, colloids, proteins, particles, etc. in the solution. It has the characteristics of low pressure, large water production, and easy operation. The membranes involved include reverse osmosis and nanofiltration membranes. Reverse osmosis membrane is the finest membrane separation product, which can effectively retain all dissolved salts and organic matter with a molecular weight greater than 100, while allowing water molecules to pass through. Nanofiltration (NF) is a membrane separation technology between ultrafiltration (UF) and reverse osmosis (RO), also known as "loose reverse osmosis", the same as ultrafiltration and reverse osmosis, nanofiltration membrane It is also a membrane separation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/64B01D71/02B01D69/12B01D67/00C02F1/44C02F101/30
CPCB01D71/021B01D71/64B01D71/68B01D69/12B01D67/0079C02F1/44C02F2101/308
Inventor 苏保卫梁懿之李树轩李灿张金苗
Owner OCEAN UNIV OF CHINA
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